Whenever you enter a command in PowerShell, a series of events takes place to figure out where the command is located. This starts with a PreCommandLookupAction which you can use to log commands. Have a look at this:

$ExecutionContext.InvokeCommand.PreCommandLookupAction = {

$whitelist = @(

    if ($Command -notin $whitelist -and $Obj.CommandOrigin -eq 'Runspace')

When you run this, every command you enter will be echoed to the console – except for the commands listed in $whitelist. This illustrates how the PreCommandLookupAction works: it fires whenever you enter a command, and you could write the commands to a log file as well.

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